繊維直交方向加力を受けるカラマツの破断強度に関する破壊力学的検討

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In this paper we studied the fracture of Japanese larch subjected to force perpendicular to the grain by fracture mechanics. We conducted tension tests of wood material, compact tension tests(hereinafter referred to as "CT tests"), tension tests with double notched laminates(hereinafter referred to as "C tests") and tension tests with lamina with bole hole(hereinafter referred to as "B tests"). We got J-integral, stress intensity factor and Crack Tip Opening Displacement in CT tests, stress intensity factor in C tests and B tests for fracture toughness. Additionally C tests and B tests specimens were modeled with the finite element method. Then we analyzed the cleavage fracture stress at the tip of crack. and J-integral. We studied the relation between fracture toughness to the material properties and the crack length. As results, the cleavage fracture stress was useful for brittle fracture criterion of Japanese larch.
2006-03-20